Radio Thailand World Service is the official international broadcasting station of Thailand.

It was launched on 20 October 1938 under callsign HSK-9.

Owned by the National Broadcasting Services of Thailand, the station broadcasts in 10 languages: Thai, English, Chinese, Burmese, Lao, Khmer, Malay, German, Japanese and Vietnamese.

RTWS is broadcast on the shortwave band using the relay transmitter tower of Voice of America in Ban Dung District, Udon Thani.